164 lines
5 KiB
C++
164 lines
5 KiB
C++
/**************************************************************************/
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/* file_access_unix_pipe.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "file_access_unix_pipe.h"
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#if defined(UNIX_ENABLED)
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#include "core/os/os.h"
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#include "core/string/print_string.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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Error FileAccessUnixPipe::open_existing(int p_rfd, int p_wfd) {
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// Open pipe using handles created by pipe(fd) call in the OS.execute_with_pipe.
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_close();
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path_src = String();
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unlink_on_close = false;
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ERR_FAIL_COND_V_MSG(fd[0] >= 0 || fd[1] >= 0, ERR_ALREADY_IN_USE, "Pipe is already in use.");
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fd[0] = p_rfd;
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fd[1] = p_wfd;
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last_error = OK;
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return OK;
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}
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Error FileAccessUnixPipe::open_internal(const String &p_path, int p_mode_flags) {
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_close();
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path_src = p_path;
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ERR_FAIL_COND_V_MSG(fd[0] >= 0 || fd[1] >= 0, ERR_ALREADY_IN_USE, "Pipe is already in use.");
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path = String("/tmp/") + p_path.replace("pipe://", "").replace("/", "_");
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struct stat st = {};
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int err = stat(path.utf8().get_data(), &st);
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if (err) {
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if (mkfifo(path.utf8().get_data(), 0666) != 0) {
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last_error = ERR_FILE_CANT_OPEN;
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return last_error;
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}
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unlink_on_close = true;
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} else {
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ERR_FAIL_COND_V_MSG(!S_ISFIFO(st.st_mode), ERR_ALREADY_IN_USE, "Pipe name is already used by file.");
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}
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int f = ::open(path.utf8().get_data(), O_RDWR | O_CLOEXEC);
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if (f < 0) {
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switch (errno) {
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case ENOENT: {
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last_error = ERR_FILE_NOT_FOUND;
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} break;
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default: {
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last_error = ERR_FILE_CANT_OPEN;
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} break;
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}
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return last_error;
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}
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// Set close on exec to avoid leaking it to subprocesses.
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fd[0] = f;
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fd[1] = f;
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last_error = OK;
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return OK;
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}
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void FileAccessUnixPipe::_close() {
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if (fd[0] < 0) {
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return;
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}
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if (fd[1] != fd[0]) {
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::close(fd[1]);
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}
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::close(fd[0]);
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fd[0] = -1;
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fd[1] = -1;
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if (unlink_on_close) {
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::unlink(path.utf8().ptr());
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}
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unlink_on_close = false;
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}
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bool FileAccessUnixPipe::is_open() const {
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return (fd[0] >= 0 || fd[1] >= 0);
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}
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String FileAccessUnixPipe::get_path() const {
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return path_src;
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}
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String FileAccessUnixPipe::get_path_absolute() const {
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return path_src;
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}
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uint64_t FileAccessUnixPipe::get_buffer(uint8_t *p_dst, uint64_t p_length) const {
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ERR_FAIL_COND_V_MSG(fd[0] < 0, -1, "Pipe must be opened before use.");
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ERR_FAIL_COND_V(!p_dst && p_length > 0, -1);
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uint64_t read = ::read(fd[0], p_dst, p_length);
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if (read == p_length) {
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last_error = ERR_FILE_CANT_READ;
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} else {
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last_error = OK;
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}
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return read;
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}
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Error FileAccessUnixPipe::get_error() const {
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return last_error;
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}
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void FileAccessUnixPipe::store_buffer(const uint8_t *p_src, uint64_t p_length) {
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ERR_FAIL_COND_MSG(fd[1] < 0, "Pipe must be opened before use.");
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ERR_FAIL_COND(!p_src && p_length > 0);
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if (::write(fd[1], p_src, p_length) != (ssize_t)p_length) {
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last_error = ERR_FILE_CANT_WRITE;
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} else {
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last_error = OK;
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}
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}
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void FileAccessUnixPipe::close() {
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_close();
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}
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FileAccessUnixPipe::~FileAccessUnixPipe() {
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_close();
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}
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#endif // UNIX_ENABLED
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